It would be interesting to see the engine serial number - in that year, the ID contained date information and information designating the vehicle it which that engine was first installed.
There was no Chevrolet truck option for the high-pressure 235 in 1953. The first-year high-pressure 235 supposedly only came as standard equipment in 1953 Powerglide-equipped cars and it came as the standard engine in the 1953 Corvette - the Blue Flame Six.
